Structure for stopping a machine in a given position



United States Patent Inventor Joseph Chudner 147 W. 24th St., New York, New York 1001 1 Appl. No. 68 1,470

Filed Nov. 8, 1967 Patented Oct. 20, 1970 STRUCTURE F OR STOPPING A MACHINE IN A GIVEN POSITION 10 Claims, 9 Drawing Figs.

11.8. C1 192/148, 1 12/219 Int. Cl .,Fl6d 71/00, D05b 69/00 Field of Search 1 12/219,

219(A).220.6787(("ursory).2l9(FD): 192/148. 144. I49. 138. 139

Primary ExaminerH. Hampton Hunter Attorney- Blum. Moscovitz. Friedman. and Kaplan ABSTRACT: A device for stopping a machine in a given position, such as a device for stopping a sewing machine in a position where the needle is out of the work. A stationary stop has a stopping position situated in the path of movement of the movable stop and a nonstopping position situated beyond the path of movement of the movable stop. An operator-actuated means, a treadle in the case of a sewing machine, actuates a drive while simultaneously locating the stationary stop in its nonstopping position, and coacts with the drive and the stationary stop to drive the machine and locate the stationary stop in its stopping position when a given operation of the machine is completed and the machine is to be stopped in a given position.

Patefited Oct. 20, 1970 Sheet INVEN JOSEPH CHUDNER I ATTORNEYS Patented Oct. 20, 1970 3,534,845

ATTORNEYS Patented Oct. 20, 1970 Sheet Patented Oct. 20, 1970 Sheet M E 2-! an! WJM'OR. um JOSEPH CHUDNER STRUCTURE FOR STOPPING A MACHINE IN A GIVEN POSITION BACKGROUND OF THE INVENTION The invention relates to devices for stopping machines in a given position.

For example, in the case of a sewing machine, it is important for the machine to be stopped at a position where the needle is located out of the work. Such machines are conventionally operated by actuation of a treadle, for example, and as long as the operator maintains the treadle depressed, the machine will continue to operate in a normal way. When a given operation is completed the operator simply releases the treadle, and while it may happen that the machine will come to rest with the needle out of the work, it also happens that the machine comes to rest with the needle extending into the work. Under these latter conditions it is necessary for the operator to manually actuate the machine until it is placed in a position where the needle is out of the work.

This latter requirement of a manual operation is an inconvenience in the operation of the machine and furthermore results in a loss of time and thus undesirably increases the costs of the operation of the machine.

SUMMARY OF THE INVENTION It is accordingly a primary object of the present invention to provide a device which will eliminate the above drawbacks.

In particular, it is an object of the invention to provide a structure which can be actuated by the operator for the purpose of shunting a machine in a given position when it is stopped.

In particular, in the case of sewing machines, it is an object of the invention to provide a device which can be very conveniently actuated by the operator for the purpose of locating the sewing machine, when it is stopped, in a position where the needle is out of the work.

It is furthermore an object of the present invention to provide a device of this type which can be very easily connected to conventional machines, so that it is not necessary to provide an entirely new machine in order to accommodate the structure of the invention.

Furthermore, it is an object of the present invention to provide a structure which is capable of being easily adjusted so as to be accommodated not only to the operator but also to the particular machine.

Furthermore, it is an object of the invention to provide a structure of the above type which will not subject the machine to undesirable shocks or other stresses when the machine is stopped in the predetermined position.

Also, it is an object of the invention to provide a device of the above type with a means which enables the device of the invention to be locked out of operation whenever desired.

The objects of the present invention also include the provision of a structure which can accomplish all of the above objects while at the same time being simple, compact, relatively inexpensive, highly reliable in operation, and very easy to install.

In accordance with the invention the structure includes a drive means which drives the machine and a movable stop means operatively connected to the drive means to be moved thereby along a given path during operation of the machine. A stationary stop means has a stopping position located in the path of movement of the movable stop means and a nonstopping position situated beyond the path of movement of the movable stop means, and a support means supports this stationary stop means for movement between these positions. An operator-actuated means, which may include a treadle in the case of a sewing machine, coacts with the drive means and with the stationary stop means for situating the latter in its nonstopping position while actuating the drive means to operate the machine during normal operations, so that at this time the movable stop means can simply be moved along the above-mentioned path of movement thereof by the drive means without engaging the stationary stop means. However, when it is desired to stop the machine in a given position after a predetermined operating period of the machine has terminated, the operator can actuate the operatoractuated means to again actuate the drive means while displacing the stationary stop means to its stopping position so that at this time the movable stop means will move along its path of movement only until it engages the stationary stop means, and at this time the drive means will not be capable of further operating the machine so that the machine is stopped in this way in a predetermined position.

Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.

The invention accordingly comprises the features of construction, combinations of elements, and arrangements of parts which will be exemplified in the constructions hereinafter set forth, and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS For a fuller understanding of the invention, reference is bad to the following description taken in connection with the accompanying drawings, in which:

FIG. I is a schematic perspective illustration of a sewing machine provided with the device of the invention;

FIG. 2 is an end elevation of the machine of FIG. I as seen from the right of FIG. 1;

FIG. 3 shows in elevation the device of the invention at the part thereof which is located at the upper right portion of FIG. 2, on a scale larger than the illustration in FIG. 2 and with a cover plate of the housing removed so as to illustrate the interior structure;

FIG. 4 is a sectional plan view taken along line 4-4 of FIG. 3 in the direction of the arrows;

FIG. 5 is a view of the structure of FIG. 3 showing the parts in a position different from that of FIG. 3;

FIG. 6 is a transverse sectional elevation of the structure of FIG. 5 taken along line 6-6 of FIG. 5 in the direction of the arrows;

FIG. '7 is a fragmentary side elevation of a treadle and motion-transmitting bar of the device of the invention;

FIG. 8 is a partly sectional fragmentary elevation illustrating the treadle and a drive transmission actuated thereby; and

FIG. Q is a schematic illustration of the needle of the sewing machine.

DESCRIPTION OF A PREFERRED EMBODIMENT Referring now to FIG. I, the apparatus 10 illustrated therein is a sewing machine which includes a conventional unit 12 mounted on the table M. The sewing unit 112 has a conventional needle-carrying lever 16 which swings about a horizontal axis during movement of the needle 18 (FIG. 9) into and out of the work 20, this particular mechanism providing blind stitching as is well known. During operation of the machine the lever 16 swings between the solid and dot-dash line positions indicated in FIG. 9, and at the end of a period of operation of the machine it may happen that the needle 18 is situated in the work 20 when the machine stops moving. In a conventional machine the operator would now be required to manually operate the machine to locate the needle 13 in the solid line position thereof shown in FIG. 9 where the needle is out of the work. The device of the invention eliminates the requirement for manual movement of the drive of the machine.

The machine is driven by a rotary drive means 22 (FIG. 2) which includes a pulley 24 (FIG. 4i). This pulley 243 is driven by way of a belt 26 of the drive means, and this belt 26 is in turn driven from a pulley 2h rotated by a motor 30 which is actuated in a manner described below. The rotary drive means 22 includes a rotary shaft which turns with the pulley 24, and which extends into the unit 112 so as to operate the structure thereof. The pulley 24 is situated in front of an outside of a removable cover plate 32 which is releasably fixed as by suitable screws, for example, to a housing 34 (FIGS. 3 and 4) of the device of the invention. In order to remove the cover plate 32 the pulley 24 is removed from the drive shaft in a known way, and after the cover 32 is replaced on the housing 34 the pulley 24 is replaced by being fixed on the outer end of the drive shaft which is not illustrated and which extends outwardly beyond the cover 32 through an unillustrated opening thereof.

The rotary drive means 22 includes within the housing 34 a rotary member 36 which is fixed to and turns with the drive shaft and which carries a movable stop means 38 in the form of a radial projection integral with and extending radially from the part 36 of the drive shaft and having a construction of a single tooth which rotates with the drive shaft about a horizontal axis normal to the plane of FIG. 3. Thus, in the illustrated example the element 38 forms a moveable stop means which is operatively connected to the drive means 22 to be driven thereby along a circular path during operation of the drive means 22.

This movable stop means 38 is adapted to coact with a stationary stop means .40 in the form of a lever swingable about the shank of a screw 42 threaded into the vertical wall 44 of the housing 34 and passing through a bore of the lever 40. The screw 42 and the wall 44 form a support means supporting the stationary stop means 40 for movement between the nonstopping position thereof shown in FIG. 3 and the stopping position thereof shown in FIG. 5. The stationary stop means 40 fixedly carries at its top end a block 44' which is directly engaged by the movable stop means 38 in a manner described below.

The swingable stationary stop means 40 fixedly carries a catch member 46 which has an outer curved catch end 48 adapted to be received in a notch which is formed in the left side edge of a catch lever 50, as viewed in FIGS. 3 and 5. The catch lever 50 is supported for swinging movement on the shank of a screw 52 which is threaded into the wall 44 of the support means, and a spring 54 urges the lever 50 in a clockwise direction, as viewed in FIGS. 3 and 5.

As is particularly apparent from FIG. 6, the catch member 46 fixedly carries at its rear surface a pin 56 onto which the bottom end of a spring means 58 is hooked. This spring means 58 is in the form of an elongated coil spring the upper end of which is fixed to the wall 44 by a screw 60. Thus, the spring means 58 urges the stationary stop means 40 to turn from its nonstopping position of FIG. 3 to the stopping position of FIG. 5. The spring 54 of the catch means 46, 50 is also hooked at one end on a pin which projects rearwardly from the upper end of the lever 50 and at its opposite end the spring 54 is fixed by a screw to the wall 44.

During normal operation of the machine the stationary stop means 40 is in its nonstopping position shown in FIG. 3, but after the machine is stopped the stop means 40 is to be displaced to its stopping position shown in FIG. 5. For this purpose there is an operator actuated means which includes an elongated bar 60 which is vertically displaceable as viewed in FIGS. 3 and 5. This bar 60 is guided for movement in a pair of end notches formed in a pair of lugs 62 and 64 integral with and projecting forwardly from the wall 44. A pair of straps 66 and 68 are bolted to the front end faces of the lugs 62 and 64, respectively, and extend across the notches and across the exposed front surface of the bar 60 so that in this way the bar 60 is guided for vertical movement by the support means. The upper lug 64 is formed with an opening through which the spring 58 freely extends to the pin 56, as is apparent from FIG. 6. The bar 60 fixedly carries a L-shaped projecting member 70 which engages the lower lug 62 so as to limit the downward movement of the bar 60. This projection 70 fixedly carries at the region of its outer end a rearwardly directed camming pin 72 which engages the curved camming edge 74 at the lower left corner of the catch lever 50, as viewed in FIGS. 3 and 5, so that during upward movement of the bar 60 the pin 72 will swing the lever 50 in opposition to the spring 54 in a counterclockwise direction around the shank of the screw 52, thus releasing the catch member 46 so that the spring means 58 will ,now swing the stationary stop means 40 from the nonstopping position thereof shown in FIG. 3 to the stopping position thereof shown in FIG. 5. Fixed to the bottom end of the stop lever 40 is a plate 76 the left free end of which, as viewed in FIGS. 3 and 5, engages a stop ledge 78 projecting forwardly from the front surface of the wall 44, so that in this way the stopping position of the stationary stop means 40 shown in FIG. 5 will be determined. In this latter position a stationary stop means 40 is located in the path of movementof the movable stop means 38 which turns with the drive means 22, in a manner described below, until the movable stop means 38 engages the stationary stop means 40 and now the drive shaft will have the angular position shown in FIG. 5, and in this position the needle 18 is in the solid line position shown in FIG. 9 displaced out of the work.

The bar 60 fixedly carries in the region of its upper end a limiting pin 80 (FIG. 6) which engages the upper lug 64 to limit the upward movement of the bar 60. Also, the bar 60 carries a return pin 82 which extends over the top edge of the catch member 46, so that when the bar 60 returns to its lower position shown in FIG. 3, the return pin 82 will engage the top edge of the catch member 46 to turn the latter and the stationary stop member therewith in a clockwise direction to the position of FIG. 3, and at this time the catch end 48 of the catch member 46 will snap into the catch notch of the catch lever 50 so that the parts will be maintained in a position shown in FIG. 3 where the stationary stop means 40 is now in its nonstopping position situated beyond the path of movement of the movable stop means 38.

A brake means 82 is provided for retarding the rotary movement of the drive means 22 when the stop means 44 is in the stopping position thereof shown in FIG. 5. This brake means 82 includes an elongated relatively heavy leaf spring 84 fixed at its left end, as viewed in FIGS. 3 and 5, to a block 86 formed with the bore through which a shank of a screw 88 extends, this screw 88 being threaded into a boss 90 which is fixed to and projects forwardly from the wall 34, as shown most clearly in FIG. 4. Thus, the spring 84 is swingable about the shank of the screw 88, and this spring 84 carries a layer of friction material 90 adapted to be pressed against the exterior surface of a circular hub portion 92 of the drive means 22 when the right end of the spring 84 is urged downwardly. This right end of the leaf spring 84 is formed with an opening through which a rod 94 freely extends, and this rod 94 fixedly carries a collar 96 which engages the undersurface of the leaf spring 84. A spring 98 is coiled about the rod 94 over the spring 84 and extends with the rod 94 freely through an opening 100 formed in the top wall of the housing 34. At its outer, upper end the rod 94 fixedly carries a knob 102 whose lower surface engages the top end of the spring 98.

At its lower end the rod 94 is threaded into a tapped bore of elongated block member 104, and a stop nut I06 maintains the rod 94 in its adjusted position with respect to the block 104. This block 104 is pivoted at its lower end to the right end of a lever 108 which is supported for swinging movement on the shank of a screw 110 which is threaded into the wall 44 of the support means, and the lever 108 is formed at its left end, as viewed in FIGS. 3 and 5, with an elongated slot 112 through which the shank of a screw I14 passes, this screw 114 being received in a tapped opening of the bar 60 just over the member 70 which is fixed thereto. Thus, with this construction when the bar 60 is raised from the position of FIG. 3 to that of FIG. 5 the lever 108 will swing in a clockwise direction to pull downwardly on the rod 94, compressing the spring 98, and applying the brake means 82 to the drive means 22. It will be noted that simultaneously the stationary stop means 40 has been displaced to the stopping position thereof shown in FIG. 5, so that with this construction the brake means 82 acts to retard the movement of the drive means while the movable stop means 38 moves into engagement with the stationary stop means 40, and as a result shocks and vibrations which might otherwise occur are avoided so that the components of the machine are not unduly stressed.

The shank of the pivot screw also serves to support for swinging movement a manually operable lockout means 116 in the form of a manually turnable lever 118 situated behind the lever 108 and formed with a bore through which the shank of the screw 110 passes. This lever 118 fixedly carries at its right end, as viewed in FIGS. 3 and 5, a rod 120 which extends through a slot 122 formed in the right wall 124 of the housing 34, and the outer end 126 of the rod 120 is accessible to the operator so that the operator can turn the lever 118 in a counterclockwise direction about the shank of the screw 110 until the rod 120 is received in a laterally extending notch 128 which communicates with the slot 122 which extends in a generally vertical direction. The lever 118 has sufficient longitudinal play along the shank of the screw 110 to permit the fixedly carries a pin 130 which projects forwardly over the top edge of the catch member 46, and when the lockout means 116 has been displaced to the lockout position thereof shown in dot-dash lines in FIG. 3, this pin 130 is situated directly next to the upper edge of the catch member 46 to prevent movement of the stationary stop means 40 by the spring means 58 to the stopping position thereof even if the bar 60 is raised so that the spin 72 will cam the catch lever 50 to its position releasing the catch member 46. In this way it becomes possible with the lockout means 116 to optionally situate the components in a position where they will not be actuated even during upward movement of the bar 60. When the lockout means 116 is in its nonlockout position shown in solid lines in FIGS. 3 and 5, however, the structure will operate in the manner described above. 7

The above-described structure of the invention is very easy to mount on a conventional sewing machine. It is only required to remove from the drive shaft of the machine the conventional driving pulley around which the top end of the belt 26 extends, and then the housing 34 is placed on the machine with the drive shaft extending therethrough and the pulley 24 is used to replace the conventional pulley. In order to adjust the structure during the mounting thereof on the machine the operator can manually depress the rod 94 so as to determine the force with which the brake means 82 engages the hub 92 of the rotary drive means. For this purpose the rod 94 can be threaded to a greater or lesser extent into the element 104 and the position of the collar 96 along the rod 94 can be adjusted.

The above-described structure of the invention is actuated by an operator-actuated means of the invention, and this operator-actuated means includes an elongated rod 132 releasably fixed at its top end, as by a strap 134, to the bottom end of the bar 611 which extends through a suitable opening formed in the lower wall 136 of the housing 34. This opening l38is aligned with an elongated opening 140 which is formed in the top of the table 14, so that the rod 132 extends freely downwardly below the top of the table 14 beneath this table top.

Referring now to FIG. 7, it will be seen that the lower end of the rod 132 is threaded into a tapped bore formed in a plug 142 which closes the top end of a cylindrical tube 146 within which an upper compression spring 148 is housed, this spring pressing at its top end on the plug 142 and at its bottom end on a pistonlike washer 150 which is fixed to the top end of a rod 152 which extends slidably through an axial bore of a lower plug 154 which is threaded into the lower end of the cylinder- 146 in the same way that the plug 142 is threaded into the upper end thereof. A second spring 156 is coiled about the rod 152 and presses against the plug 154 and the washer 150. The lower portion of the rod 152 which extends out beyond the plug 154 overlaps an elongated rod 158 and is adjustably fixed thereto by a sleeve 160 which carries a set screw 162. Thus, by loosening the set screw 162 the extent of overlap of the rod 158 with the rod 152 can be adjusted, and then the screw 162 is tightened to maintain the adjustment. At its bottom end the rod 158 is of a hook-shaped configuration and extends through an opening formed in the rearwardly directed portion 164 of an L-shaped member 166 which is fixed to the inner, rear edge of a treadle 168 which together with this rod assembly and the bar 60 forms a part of an operator-actuated means of the structure of the invention.

The treadle 168 is supported for swinging movement by a pair of coaxial pins carried by ears 170 which extend upwardly from a pair of end members 172 which are adjustably fixed to a transverse brace 17 i extending between and fixed to bars 176 of the table 14. At their outer ends the members 172 threadedly carry jack screws 178 which can be threaded into engagement with the floor to provide for a solid mounting of the operator-actuated means, and the members 172 which support the treadle 168 for swinging movement can be selectively fixed to the brace 174 in suitable slots 186 thereof through any suitable bolts of the like.

The above-described part of the operator-actuated means of the invention includes the control transmission means formed by the rod assembly described above for actuating the stationary stop means so that it will be moved from its nonstopping to its stopping position when the operator-actuated means is actuated by the operator in a manner described below.

This operator-actuated means also includes a drive transmission for stopping and starting the motor 30 so as to start and stop the drive means. This drive transmission includes an elongated axially bored rod 162 (FIG. 8) extending freely through an opening formed in a plate 184!- which is adjustably fixed to the treadle 166. For this purpose the treadle 168 is formed adjacent its inner rear edge with an elongated slot, and the edges which define this slot are engaged at their lower surface portions by the plate 184 while the upper surfaces of these edges are engaged by transverse fixing straps 1116 connected by suitable screws to the plate 186 so that by loosening these screws the plate 18 1 can be situated at a selected location along the slot of the treadle 16%, and then the parts can be fixed in a selected position.

The rod 162. has an upper portion 163 of relatively small diameter overlapping and adjustably fixed to a rod 196, the extent of overlap between the rods 1611 and 1911 being adjusted by a sleeve 192 carrying a set screw 194, so that this adjustment may be brought about in the same way as the adjustment between the overlapping rods 152 and 158. The top end of the rod 196 is of hook-shaped configuration and extends through a selected opening of a swing lever 196 which turns to close the circuit of the driving motor 311, when the rod 199 is pulled downwardly, the parts automatically returning, when the operator releases the treadle 158, to a position where the rod moves up and the swing lever 196 returns to its position opening the circuit of the motor 36.

As may be seen from FIG. 8, the rod 182 is formed with a transverse slot 198 extending therethrough and receiving a cross-pin 200 which extends through a loop at the upper end of a motion-transmitting flexible wire 262 which extends upwardly through the bore of the rod 132. The pin 206 is fixed to the wire 2112 in the upper loop thereof in any suitable way so that it is capable of moving up and down along the slot 198 but cannot move longitudinally out of the slot, and the free ends of the pin 200 engage the upper surface of a rotary disc 2116 which is knurled at its exterior surface and which forms a nut threaded onto an exteriorally threaded portion of the rod 162. Beneaththe nut 264 is a washer engaged by a locknut 206 which acts through the washer on the adjusting nut 2M so as to maintain the cross-pin 21M) and thus the top end of a flexible wire 202 at a selected elevation along the rod 182.

The treadle carrying members 172 are fixed to a plate 263 which extends between the members 172 and which is fixed directly to the brace 174, and this plate 263 has at its rear edge ears 210 carrying a pin 212 on which a roller 214 is supported for free rotary movement. The flexible wire 202 is guided around the roller 214 and at its top end is fixed to a lug 216 which is integral with and projects downwardly from the plate 184, the wire 202 extending through asuitable opening of the lug 216 for this purpose.

The threaded portion of the rod 182 also carries a nut 218 which engages the top end of a coil spring 220 which is coiled about the rod 182 and which presses at its bottom end against a washer 224 which engages the top surface of the plate 184, as indicated in FIG, 8.

This operator-actuated means of the invention operates in the following manner:

when the machine is at rest the spring 220 holds the plate 184 against a nut 236 at the bottom end of the rod 182. in order to operate the machine in the normal manner the operator will swing the treadle 168 in a clockwise direction, as indicated by the arrow 228 in FIG. 7, and this will result in downward displacement of the rod l88 together with the rod 190 so as to swing the lever 196 and close the circuit of the motor 30. As a result the belt 26 drives the drive means 22 and the machine will operate in the usual manner. At this time the rod 158 will also be pulled downwardly, as indicated by the arrow 230 in FIG. 7, but this will simply result in compressing of the spring 156 by the washer 150 and the bar 60 will remain in its lower position which is determined by the engagement of the member 70 with the lower lug 62 of the support means, as described above.

Thus, the stop means 40 will now remain in its nonstopping position, and the operation of the machine will proceed in a normal manner.

At the end of the operation the operator will simply release the treadle 168, and a spring which acts on lever 196 will turn the latter back to its rest position where the circuit of the motor 30 is open, and now the treadle returns to its rest position, and it will be noted that the springs 148 and 156 will act on the washer 150 to also locate the treadle in its normal position. The movement of the washer 150 is of course transmitted to the treadle through the rods 152 and 158.

Assuming that the machine has stopped in a position where the needle 18 is located in the work 20, all that the operator need do at this time is to press with a heel of the foot on the front outer edge of the treadle 168 so as to turn the latter in the direction of the arrow 232 shown in FIG. 8, and at this time the inner edge of the treadle will be displaced upwardly, as shown by the arrow 234 in FIG. 8. The result is that even though the inner or rear portion of the treadle moves upwardly, the wire 202 is pulled upwardly at its right end where it is connected to the lug 216 so as to pull downwardly on the pin 200 and thus act through the nut 204 on the rod 182 to displace the latter downwardly together with the rod 188, so that at this time also the circuit of the motor 30 is closed in the same way as during normal operations. However, at this time the rod 158 will be displaced upwardly instead of downwardly, and the upward movement is transmitted to the Washer 150 which through the spring 148 acts on the rod 132 to displace the latter upwardly with the bar 60, and the result is that the catch member 46 is released from the catch lever 50 so that the spring means 58 will swing the stationary stop means 40 to the stopping position thereof shown in FIG. 5. This upward movement of the bar 60 will also act to displace the brake means 82 to its braking position, as described above. As a result the driving of the machine is retarded at this time by the brake means and the machine will continue to operate until the movable stop means 38 engages the stationary stop means 40, and now the drive shaft will have a predetermined angular position where the needle 18 is located out of the work, as shown in solid lines in FIG. 9. These operations for automatically situating the machine in a predetermined stopped position take only a few seconds after which the operator releases the treadle so that the parts all return to their rest position with the needle out of the work.

Thus, with the structure of the invention the operator will simply swing the treadle in one direction, indicated by the arrow 228, during normal operations, and after the operations have stopped the operator will then swing the treadle in the opposite direction, indicated by the arrow 232 in FIG. 8, so as to bring about automatic stopping of the machine in a preselected position which in the case ofa sewing machine is one where the needle is out of the work. Of course, while the invention has been described in connection with blind stitch sewing machine, it can be used with any type of sewing machine and in fact with any machines where it is required that the machine be stopped at a given position.

it will thus be seen that the objects set forth above, among those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above constructions without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

lclaim:

1. in a machine which must be stopped in a given position, such as asewing machine which must be stopped with the needle out of the work, drive means for driving the machine, movable stop means operatively connected to said drive means to be moved along a given path thereby, stationary stop means having a stopping position situated in the path of said movable stop means and a nonstopping position situated out of the path of said movable stop means, support means sup porting said stationary stop means for movement between said positions, and operator-actuated means operatively connected with said drive means and with said stationary stop means for actuating said drive means when said operator-actuated means are moved in one direction while maintaining said stationary stop means in nonstopping position during operation and subsequent stopping of the machine and, if the machine has not stopped in said given position, for then moving said stationary stop means to said stopping position thereof and again actuating said drive means when said operator-actuated means are moved in a second direction to drive the machine at the end of an operation thereof, so that said movable stop means will then move into engagement with said stationary stop means to stop said drive at said given position.

2. The combination of claim 1 and including a brake having a braking position coacting with said drive means for retarding the operation thereof and a nonbraking position releasing said drive means for unrestrained operation, said operatonactuated means being operatively connected with said brake means for placing the latter in said braking position when placing said stationary stop means in said stopping position thereof, so that said drive means will be retarded during movement of said movable stop means into engagement with said stationary stop means, and for situating said brake means in said nonbraking position thereof when said stationary stop means is in said nonstopping position thereof.

3. The combination of claim 1 and including a manually operable lockout means carried by said support means for movement between a lockout position and a nonlockout position, said lockout means when in said lockout position thereof coacting with said stationary stop means for maintaining the latter in said nonstopping position thereof even when said operator-actuated means is actuated to displace said stationary stop means to said stopping position thereof, and said lockout means releasing said stationary stop means for movement to said stopping position thereof when said lockout means is in said nonlockout position thereof.

operator-actuated means operatively connected with said drive means and with said stationary stop means for actuating said drive means when said operator-actuated means are moved in one direction while maintaining said stationary stop means in said nonstopping position during operation and subsequent stopping of the machine and for then moving said stationary stop means to said stopping position thereof and again actuating said drive means when said operator-actuated means are moved in a second direction to drive the machine at the end of an operation thereof, so that said movable stop means will then move into engagement with said stationary stop means to stop said drive means at a given position, said operator-actuated means including a treadle swingable in a pair of opposed directions, drive transmission means operatively connected. to said treadle and said drive means for transmitting movement from said treadle to said drive means to actuate the latter irrespective of the direction of swinging movement of said treadle, and control transmission means operatively connected between said treadle and stationary stop means for moving the latter from said nonstopping to said stopping position thereof when said treadle is swung in only one of said directions.

5. The combination of claim 4 and including a spring means coacting with said stationary stop means for urging the latter to said stopping position thereof and a catch means carried by said support means and coacting with said stationary stop means for releasably holding the latter in said nonstopping position thereof in opposition to said spring means, said control transmission means coacting with said catch means for actuating the latter to release said stationary stop means to said spring means to be moved thereby to said stopping position thereof when said treadle is moved in said one direction.

6. The combination of claim 5 and wherein said catch means includes a catch lever swingably carried by said support means, a catch member fixed carried by said stationary stop means to engage said catch lever and be held thereby in opposition to said spring means in a location situating said movable stop means in said nonstopping position, and said control transmission means including a longitudinally movable bar guided by said support means for longitudinal movement and moved longitudinally when treadle is swung in said one direction, said bar carrying a camming projection which engages said catch lever and swings the latter away from said catch member when said treadle is swung by the operator in said one direction.

7. The combination of claim 6 and wherein said bar carries a return projection engaging and catch member to displace the latter back into engagement with said catch lever while returning said movable stop means to said nonstop position thereof during return of said bar to a rest position upon release of said treadle after the latter has been swung in said one direction to locate said movable stop means in engagement with said stationary stop means.

8. The combination of claim 7 and including a brake means coacting with said drive means for retarding the operation thereof when said brake means is in a braking position, said brake means being carried by said support means for movement between said braking position and a nonbraking position releasing said drive means for unrestrained movement, and linkage means interconnecting said bar of said control transmission means with said brake means for displacing the latter from said nonbraking to said braking position thereof when said bar is longitudinally displaced upon swinging of said treadle in said one direction.

9. The combination of claim 7 and including a manually operable lockout lever swingably carried by said support means for swinging movement between a lockout position and a nonlockout position, said lever having a projection which engages said catch member and prevents turning of said sta' tionary stop means to said stopping position thereof during longitudinal movement of said bar upon swinging of said trea dle in said one direction when said lever is in said lockout posi- 10. The combination of claim 1 and wherein said drive means includes a rotary member turnable about a given axis and fixedly carrying said movable stop means for rotation therewith about said axis, said stationary stop means being carried by said support means for swinging movement about an axis parallel to the axis of said member of said drive means and said stationary stop means having in said nonstopping position thereof an angular position displaced beyond the circular path of movement of said movable stop means and in said stopping position thereof an angular position situated in the circular path of movement of said movable stop means. 

